STOP AND START SYSTEM

FUNCTION OF MAIN COMPONENTS

Component		Function
Engine Stop and Start ECU		Sends either an engine stop or restart signal to the ECM according to the signals from each sensor and switch.
Engine Stop and Start ECU	Backup Boost Converter	Supplies battery voltage to help make up for the voltage drop that occurs when the engine is restarted, preventing the operation of various systems from being interrupted due to low battery voltage. Supplies battery voltage to the electric oil pump for CVT.*1
Park/Neutral Position Switch Assembly*1		Detects whether the shift lever position is in park/neutral and sends a signal to the engine stop and start ECU via the ECM.
Clutch Switch Assembly*2		Recognizes that the clutch pedal is depressed and sends a signal to the engine stop and start ECU.
Neutral Position Switch*2		Recognizes that the shift lever is in N and sends a signal to the engine stop and start ECU.
Brake Vacuum Pressure Sensor		Detects the brake booster vacuum pressure and sends a signal to the engine stop and start ECU.
Hood Lock Assembly	Engine Hood Courtesy Switch	Detects whether the hood is open or closed and sends a signal to the engine stop and start ECU.
Front Door Courtesy Light Switch Assembly (Driver Side)		Detects whether the driver door is open or closed and sends a signal to the engine stop and start ECU via the main body ECU (multiplex network body ECU) via CAN communication.
Front Seat Inner Belt Assembly (Driver Side)	Front Seat Belt Buckle Switch (Driver Side)	Detects whether or not the driver's seat belt has been fastened, and sends a signal to the engine stop and start ECU via the main body ECU (multiplex network body ECU) via CAN communication.
Air Conditioning Amplifier Assembly		Sends an outside temperature signal and A/C switch signal to the engine stop and start ECU.
Combination Meter Assembly	Stop and Start Indicator Light	Turns on when the engine is stopped due to stop and start control. Blinks to inform the driver that the idling stop is canceled and the engine will restart when the driver door is opened with the shift lever in D or M during idling stop.1 If the shift lever is moved out of N without the clutch pedal depressed during idling stop, the buzzer sounds and the stop and start indicator light blinks at the same time. 2
	Stop and Start Cancel Indicator Light	Turns on to inform the driver that the system has been disabled when stop and start system operation is prohibited by the stop and start system cancel switch (ecorun cancel switch assembly). If a system malfunction is detected, the stop and start cancel indicator light blinks to inform the driver.
	Multi-information Display	Displays information based on the selected display mode. One display mode shows the current idling stop time, the idling stop time since the ignition switch was turned ON and the total idling stop time since the last time the idling stop time was reset. The other display mode shows the current idling stop time, the fuel consumption amount since the ignition switch was turned ON and the total fuel consumption amount since the last time the idling stop time was reset. Displays the settings of the stop and start system or warning information, etc.
Stop and Start System Cancel Switch (Ecorun Cancel Switch Assembly)		Operation of the system can be canceled by pressing the stop and start system cancel switch (ecorun cancel switch assembly). Pressing the switch again or turning the power source off and back on restores the operation of the system.
ECM		Sends various information about engine conditions to the engine stop and start ECU. Based on signals from the battery sensor (battery state sensor assembly), determines whether the battery installed on the vehicle is a specified or non-specified battery, and sends the determination result to the engine stop and start ECU.
Skid Control ECU		Sends a vehicle speed signal to the engine stop and start ECU.
Center Airbag ECU Assembly		Sends airbag deployment information in the event of a collision and a deceleration signal to the engine stop and start ECU.
Main Body ECU (Multiplex Network Body ECU)		Sends a front door courtesy light switch assembly (driver side) signal and front seat belt buckle switch (driver side) signal to the engine stop and start ECU.
Power Steering ECU Assembly		Sends an electrical power steering assist signal to the engine stop and start ECU.
Electric Oil Pump for CVT*1		Holds the CVT oil pressure during idle stop.
Battery Sensor (Battery State Sensor Assembly)		Detects the battery charging and discharging amount and sends a signal to the ECM.
Stop Light Switch Assembly*1		Detects a brake pedal released condition and sends a signal to the engine stop and start ECU via the ECM.
Accelerator Pedal Sensor Assembly*1		Detects an accelerator pedal opening angle and sends a signal to the engine stop and start ECU via the ECM.
Crank Position Sensor		Detects the crankshaft angle when the engine is stopped and sends this information to the ECM.
Transmission Valve Body Assembly*1	CVT Fluid Temperature Sensor	Detects the CVT fluid temperature.
Engine Coolant Temperature Sensor		Sends the coolant temperature to the engine stop and start ECU via the ECM.
Generator Assembly		Sends the generator assembly generation condition to the engine stop and start ECU via the ECM.

*1: Models with CVT

*2: Models with manual transaxle

FUNCTION
1. Settings of Stop and Start System
  1. Using the steering pad switch on the steering pad switch assembly and the multi-information display on the combination meter assembly, the engine stop operation time due to stop and start control when the air conditioning system is on can be changed between "Standard" and "Extended" (the stop and start system has priority).

SYSTEM CONTROL

Early Stage Injection Control
1. Early stage injection control shortens the time it takes the engine to restart after the stop and start system stops the engine, thus allowing smooth initial acceleration.
2. The ECM memorizes the crankshaft angle detected by the crank position sensor when the engine is stopped by the stop and start system.
3. The ECM judges the injection required and decides which cylinder to ignite when the driver does restart operation. The ECM then uses this information as it starts the engine.
Hill-start Assist Function (Models with CVT)
1. The driving force (creep phenomenon) of a former CVT vehicle is regulated by depressing the brake pedal while stopped, and the driving force is transmitted by releasing the brake pedal when starting the vehicle. However, when starting a stop and start system equipped vehicle with its engine stopped due to the activation of the idle stop function, there is a short time delay before the driving force is generated as the engine will start after the brake pedal is released.
2. The hill-start assist function is a system to assist starting of a stop and start system equipped vehicle on a slope to deal with the situation described above, retaining the brake hydraulic pressure until sufficient driving force is generated.
  Tech Tips
  - The hill-start assist function operates even on level roads.
  - The brakes may produce sounds, but this is not a malfunction.
  - Brake pedal response may change and vibrations may be generated, but this is not a malfunction.

System Prohibit Control

For safety, battery protection, comfort and ECU learning reasons, the engine stop and start ECU prohibits stop and start system operation if any one of the following conditions is met.

Prohibition Reason	Condition
Safety	If the engine is started with the hood open, such as when jump starting, engine restart operation cannot be ensured. Therefore, stop and start system operation will be prohibited. The operation of the system will be restored on the next trip.
	If the driver door or hood is opened before the engine stops, stop and start system operation will be prohibited for safety reasons.
	The brake booster vacuum is insufficient.
	The driver seat belt is unfastened before the engine stops. The engine catalyst is being quickly warmed up.
Battery Protection	While recharging, stop and start system operation will be disabled. The recharging continues for 0.5 to 1 hour, and is carried out approximately every about 30 hours or driving.
	When the idling stop rate becomes higher than the predetermined rate, stop and start system operation will be disabled.
	When the battery becomes low and the battery integrated current value drops to below the threshold value, stop and start operation will be disabled.
Comfort	If the air conditioning is on when the outside temperature is high or low and the evaporator temperature is high, stop and start system operation will be prohibited.
	If the air conditioning is on when the outside temperature is low, stop and start system operation will be prohibited.
	If the heater is on when the outside temperature is low and the engine coolant temperature is low, stop and start system operation will be prohibited.
	If the front DEF switch and blower switch are on, stop and start system operation will be prohibited.
ECU Learning	ECU learning is not complete.*
Operation	If the vehicle is stopped while the steering wheel is being operated, stop and start system operation will be prohibited.

*: If the value learned by the ECU has been cleared by disconnecting the battery or for another reason, stop and start system operation will be prohibited until ECU learning is complete.

Warning Control

If any of the following operations are performed while the engine is stopped due to system control, the system will not restart the engine. The driver will be warned by a buzzer, or the engine will be regarded as stalled or will be restarted.

Operation	Warning Control
Hood is opened.	The engine status changes to 'stalled' or is restarted.
Driver seat belt is unfastened.	The engine is restarted.

Operating Conditions at Engine Stop and Restart (Models with CVT)

The engine may stop if all of these conditions are detected.

Item		Operating Condition
Idle Stop	Engine Coolant Temperature	40°C to 105°C (104°F to 221°F)
	CVT Oil Temperature	25°C to 111°C (77°F to 231.8°F)
	Driver Door	Closed
	Brake Booster Vacuum	Sufficient brake booster vacuum
	Stop and Start System Cancel Switch (Ecorun Cancel Switch Assembly)	Off condition
	Road Gradient	-8° to 8°
	Vehicle Speed	Vehicle speed changes from a constant speed to 0 km/h.
	Engine Speed	1200 r/min or less
	Shift Lever Position	D, M
	Driver's Seat Belt	3 seconds or more elapse after the seat belt is fastened.
	Engine Hood	Closed
	Battery Voltage	7.6 V or more at engine restart
	Battery Temperature	-10°C (14°F ) to 70°C (158°F)*1
	Battery Integrated Current*2	When the integrated current value meets any of the following conditions: -13478 A-sec or more: Status of Battery Charge Control is Charge Control Coordination Mode or Stop and Start Standalone Mode.3 -6048 A-sec or more: Status of Battery Charge Control is Low Temperature Mode and battery fluid temperature is between 3°C (37.4°F) and 11°C (51.8°F).4 -3974 A-sec or more: Status of Battery Charge Control is Low Temperature Mode and battery fluid temperature is between -1°C (30.2°F) and under 3°C (37.4°F).5 0 A-sec or more: Status of Battery Charge Control is Stop and Start Restriction Mode or Temperature High/Low Mode.6
	Air Conditioning	The cooling, heating and defrost functions are not operating.
	ECU Learning	Completed
	Ambient Temperature	-5°C (23°F) or more
	Steering Operation	Not operated

Tech Tips

*1: When the battery temperature becomes 75°C or higher, control is prohibited. After control is prohibited and the battery temperature falls to 70°C or lower, control is performed.

*2: Regarding Battery Integrated Current

In the stop and start system, the engine stop and start ECU switches the system control mode (stop and start system control permitted/prohibited) based on the battery condition (charge/discharge condition) to protect the battery and to ensure stable engine restarting performance.

The battery charge-discharge condition is determined from the integrated current value calculated from the battery sensor (battery state sensor assembly) signal. The integrated current value is obtained by multiplying the current (ampere) detected by the battery sensor (battery state sensor assembly). by the time (seconds), and is expressed in the unit A-sec. This can be measured by the Global TechStream (GTS).

The engine stop and start ECU determines the power charge based on the integrated current value and prohibits stop and start system control if the value is below the threshold, because the battery might not be able to start the engine. The threshold varies according to the battery temperature and battery charge condition.

*3: After the integrated current value becomes -14342 A-sec or less, in order to charge the battery, control is prohibited until the value becomes -13478 A-sec or more.

*4: After the integrated current value becomes -6912 A-sec or less, in order to charge the battery, control is prohibited until the value becomes -6048 A-sec or more.

*5: After the integrated current value becomes -4838 A-sec or less, in order to charge the battery, control is prohibited until the value becomes -3974 A-sec or more.

*6: After the integrated current value becomes -864 A-sec or less, in order to charge the battery, control is prohibited until the value becomes 0 A-sec or more.

The engine will restart if any of these conditions are detected.

Item		Operating Condition
Engine Restart	Brake Booster Vacuum	Insufficient brake booster vacuum
	Air Conditioning	When the air conditioning is on and a timer in the air conditioning amplifier assembly completes.
	Air Conditioning	When the automatic blower function is operating and a timer in the air conditioning amplifier assembly completes. Otherwise, a timer in the engine stop and start ECU completes.
	Stop and Start System Cancel Switch (Ecorun Cancel Switch Assembly)	The stop and start system cancel switch (ecorun cancel switch ass is turned on.
	Battery	The battery voltage is less than 11.4 V. The battery integrated current drops to below the threshold value.
	Driver's Door	The driver's door is opened.
	Driver's Seat Belt	The driver's seat belt is unfastened.
	Vehicle Speed	A vehicle speed signal is input.
	Accelerator Pedal	The accelerator pedal is depressed.
	Brake Pedal	The brake pedal is released or the master cylinder perssure is 10 Mpa or more.
	Shift Lever	The shift lever is moved from D or M to P, R or N.
	Steering Operation	The steering wheel is operated.

Operating Conditions at Engine Stop and Restart (Models with Manual Transaxle)